User`s Manual - Sewell Direct
Contents
1. eoi 0 1 MODES AVAILABLE CONTROLLER EXAMPLES eoi 1 Enable EOI assertion with last character eoi 0 Disable EOI assertion eoi Query if EOI assertion is enabled or disabled 9 5 eos This command specifies GPIB termination characters When data from host is received over the network all non escaped LF CR and ESC characters are removed and GPIB terminatots as specified by this command are appended before sending the data to instruments This command does not affect data from instruments received over GPIB port If the command is issued with no arguments then the current configuration is returned SYNTAX eos 0 1 2 3 where 0 CR LF 1 CR 2 LF 3 None MODES AVAILABLE CONTROLLER EXAMPLES eos 0 Append CR LF to instrument commands eos 1 Append CR to instrument commands e0s 2 Append LF to instrument commands eos 3 Do not append anything to instrument commands eos Query current EOS state 8 5 2008 9 Prologix GPIB LAN Controller User Manual 9 6 eot enable This command enables or disables the appending of a user specified character see eot char to network output whenever EOI is detected while reading a character from the GPIB port If the command is issued without any argument the current state of eot enable is returned SYNTAX eot enable 0 1 MODES AVAILABLE CONTROLLER EXAMPLES eot enable 1 Append user defined character when EOI detected eot enable 0 Do not append chara2. network termination character CR ASCII 13 or LF ASCII 10 is received or when the internal buffer becomes full CR LF and ESC ASCII 27 characters must be escaped by preceding them with an ESC character if they are part of the network data All un escaped LF CR and ESC characters in network data are discarded As mentioned earlier an un escaped CR or LF acts as the network terminator The terminating CR or LF is removed and GPIB termination characters specified by eos command are appended before transmitting Internal buffer is 512 bytes but is subject to change in future versions 8 5 2008 6 Prologix GPIB LAN Controller User Manual data to instruments Any network input that starts with the character sequence is interpreted as a controller command and not transmitted over GPIB When configured to do so using the auto command or the read command characters received from instruments are transmitted to host Unlike while sending data to instruments no character substitution is performed The eot char command may be used to detect GPIB EOI signal assertion 9 Commands Prologix GPIB LAN controller provides several commands to configure its behavior They are explained in detail in the following sections All commands start with the character seguence 9 1 addr The addr command is used to configure or guery the GPIB address Meaning of the GPIB address depends on the operating mo
3. PROLOGIX GPIB LAN CONTROLLER USER MANUAL VERSION 1 0 August 5 2008 PROLOGIX BIZ Prologix GPIB LAN Controller User Manual Table of Contents l TAO UCA A da iaa 4 A A O NS 4 3 Firmware Up RAS A ata 4 4 Host SoftWare in e EA A a AA iaa 4 De CONDADO Dri ii AAA A AAA AA AS 5 GG FOperatins Modena mino a lai ma ala A e 5 6 1 Controller Modena sein APs Wa NORA NE 5 6 2 DEVICE Modena iia sed deres A ess a et s kavand JAGA Nee 6 Te e Data ASAS Oia 6 8 Gomma AS 7 8 1 O E O E E OE EE re 7 8 2 TU A ina 7 SEG AA UO iia 9 8 4 CO ds 9 8 5 CONAN A A a O A TOS 9 8 6 Otal A ASE 10 8 7 CO Ciria t 10 ANN 10 8 9 Edad 10 SO Modest dada dad 11 SAA E E EEA Sd 11 8 12 read tmo Ms aaa 12 LS E AE R A O 12 8 14 Dd A 12 Bold SL ROEN rr inkad SS eee ee ee ee eee 12 8 16 WA 13 SAA MEE sag be bed rek bd Der SEES al chi Ia aaa 13 OGA Tel Miah seriens alia nsten 13 De Specifications AA 13 8 5 2008 2 Prologix GPIB LAN Controller User Manual Change Log Aug 5 2008 Initial version 8 5 2008 3 Prologix GPIB LAN Controller User Manual 1 Introduction Prologix GPIB LAN controller converts any computer with a nerwork port into a GPIB Controller or Device In Controller mode Prologix GPIB LAN controller can remotely control GPIB enabled instruments such as Oscilloscopes Logic Analyzers and Spectrum Analyzers In Device mode Prologix GPIB LAN controller converts the computer into a GPIB periphe
4. between 0 and 30 MODES AVAILABLE CONTROLLER EXAMPLE spoll 5 Serial poll instrument at GPIB address 5 spoll Serial poll currently addressed instrument 9 15 srtq This command returns the current state of the GPIB SRQ signal The command returns is SRO signal is asserted low and 0 if the signal is not asserted high SYNTAX srq MODES AVAILABLE CONTROLLER 8 5 2008 12 Prologix GPIB LAN Controller User Manual 9 16 trg This command issues Group Execute Trigger GPIB command to devices at the specified adresses Upto 14 addresses maybe specified Addresses must be separated by spaces If no address is specified then Group Execute Trigger command is issued to the currently addressed instrument as set by a previous addr command Refer to the programming manual for a specific instrument s response to Group Execute Trigger command SYNTAX trg lt address1 gt lt address2 gt lt address14 gt MODES AVAILABLE CONTROLLER 9 17 ver This command returns the version string of the Prologix GPIB LAN controller SYNTAX ver MODES AVAILABLE CONTROLLER DEVICE 9 18 help This command prints a brief summary of all available commands SYNTAX help MODES AVAILABLE CONTROLLER DEVICE 10 Specifications Dimensions 3 25 in L x 2 5 in W x 1 0 in H Weight 2 oz GPIB commands not supported PARALLEL POLL PASS CONTROL Power 8 15V DC 200 mA Indicators Power IP configuration Stati
5. c and Dynamic DHCP TCP port 1234 8 5 2008 13
6. cter when EOI detected eot enable Ouery current eot enable state 9 7 eot_char This command specifies the character to be appended to network output when eot enable is set to 1 and EOI is detected If the command is issued without any argument the currently specified character is returned SYNTAX eot char lt char gt where lt char gt is a decimal value less than 256 MODES AVAILABLE CONTROLLER EXAMPLES eot char 42 Append ASCII 42 when EOI is detected eot chat Query currently configured eot char 9 8 ifc This command asserts GPIB IFC signal for 150 microseconds making Prologix GPIB LAN controller the Controller In Charge on the GPIB bus SYNTAX ifc MODES AVAILABLE CONTROLER 9 9 loc This command enables front panel operation of the currently addressed instrument 8 5 2008 10 Prologix GPIB LAN Controller User Manual SYNTAX loc MODES AVAILABLE CONTROLLER 9 10 mode This command configures the Prologix GPIB LAN controller to be a CONTROLLER or DEVICE If the command is issued without any arguments the current mode is returned SYNTAX mode 0 1 where 1 CONTROLLER 0 DEVICE MODES AVAILABLE CONTROLLER DEVICE EXAMPLES mode 1 Switch to CONTROLLER mode mode 0 Switch to DEVICE mode mode Query current mode 9 11 read This command can be used to read data from an instrument until e FOI is detected or timeout expires or e A specified character is read or timeout
7. de of the controller In CONTROLLER mode it refers to the GPIB address of the instrument being controlled In DEVICE mode it is the address of the GPIB peripheral that Prologix GPIB LAN controller is emulating If the command is issued with no parameters the currently configured address is returned SYNTAX addr lt address gt where address is a decimal value between 0 and 30 MODES AVAILABLE CONTROLLER DEVICE EXAMPLES addr 5 Set GPIB address to 5 addr Query current GPIB address NOTE Default GPIB address of many HP GL 2 plotters is 5 9 2 auto Prologix GPIB LAN controller can be configured to automatically address instruments to talk after sending them a command in order to read their response The feature called Read After Write saves the user from having to issue read commands repeatedly This command enabled or disabled the Read After Write feature 8 5 2008 7 Prologix GPIB LAN Controller User Manual In addition auto command also addresses the instrument at the currently specified address to TALK ot LISTEN auto 0 addresses the instrument to LISTEN and auto 1 addresses the instrument to TALK If the command is issued without any arguments it returns the current state of the read after write feature SYNTAX auto 0 1 MODES AVAILABLE CONTROLLER NOTE Some instruments generate Query Unterminated or 420 error if they are addressed to talk after sending a command that doe
8. expires or e Timeout expires Timeout is set using the read tmo ms command and applies to inter character delay i e the delay since the last character was read Timeout is not be confused with the total time for which data is read SYNTAX read eoi lt char gt where lt char gt is a decimal value less than 256 MODES AVAILABLE CONTROLLER EXAMPLES tead Read until timeout read eoi Read until EOI detected or timeout read 10 Read until LF ASCII 10 is received ot timeout 8 5 2008 11 Prologix GPIB LAN Controller User Manual 9 12 read tmo ms This command specifies the timeout value in milliseconds to be used in the read command and spoll command Timeout may be set to any value between 1 and 4000 milliseconds SYNTAX read_tmo_ms lt time gt where lt time gt is decimal value between 1 and 4000 MODES AVAILABLE CONTROLLER 9 13 rst This command performs a power on reset of the controller The process takes about 5 seconds All input received over the network during this time are ignored SYNTAX rst MODES AVAILABLE CONTROLLER 9 14 spoll This command performs a serial poll of the instrument at the specified address If no address is specified then this command serial polls the currently addressed instrument as set by a previous addr command This command uses the same time out value specified by the read tmo ms command SYNTAX spoll lt address gt where address is a decimal value
9. gix GPIB LAN controller does not automatically address the instrument to talk You must use the read command to read data Controller mode is used to remotely control instruments and to download screen plots by sending plot commands from a host computer 7 2 Device Mode In Device mode Prologix GPIB LAN Controller acts as another peripheral on the GPIB bus In this mode the controller can act as a GPIB TALKER or GPIB LISTENER only Since Prologix GPIB LAN Controller is not the Controller In Charge while in this mode it expects to receive commands from a GPIB controller When Device mode is enabled Prologix GPIB LAN controller configures itself as a GPIB Listener All data received by the controller over the GPIB port is passed along to the network port without buffering All data received from the host over the network is buffered until the GPIB controller addresses Prologix GPIB LAN controller to talk at which time the buffered data is passed along to the GPIB port The controller can buffer only one command A subseguent command received over the network will overwrite the previously buffered one if the previous one has not yet been transmitted over GPIB Device mode is used to download screen plots from the instrument front panel for rendering using plotter emulation software 8 Data Transmission In Controller and Device modes characters received over the network port are ageregated in an internal buffer and interpreted when the
10. ral for downloading data and screen plots from the instrument front panel In both modes Prologix GPIB LAN controller interprets high level commands received from the host computer and performs the appropriate low level GPIB protocol handshaking 2 Installation Connect Prologix GPIB LAN controller to any network enabled computer using an Ethernet cable No special drivers are required The type of cable to use depends on the computer If the computer supports auto MDIX which almost all newer ones do use a straight Ethernet cable If the computer does not support auto MDIX use a cross over Ethernet cable If a cross over Ethernet cable is not available connect both Prologix GPIB LAN controller and computer to a network hub or switch 3 Firmware Upgrade Prologix GPIB LAN controller firmware is field upgradeable Latest firmware and upgrade installations are available at prologix biz 4 Host Software A wide variety of host software may be used to communicate with Prologix GPIB LAN controller Terminal programs any terminal emulation program such as HyperTerminal Tera Term Pro or Minicom can be used to communicate with the controller and instruments connected to it Custom applications any programming language or environment that provides network access may be used to develop custom applications Graphical programming environments like National Instruments LabView and Agilent VEE may be used as well EZGPIB an easy
11. s not generate a response often called non query commands In effect the instrument is saying I have been asked to talk but I have nothing to say The error is often benign and may be ignored Otherwise turn off read after write feature before issuing non query commands Later turn on the feature after issuing query commands to read response For example auto 0 Turn off read after write and address instrument to listen SET VOLT 1 0 Non guery command idn Ouery command auto 1 Turn on read after write and address instrument to talk HP54201A Response from instrument Or use the read command to read the instrument response For example auto 0 Turn off read after write and address instrument to listen SET VOLT 1 0 Non guery command idn Query command read eoi Read until EOI asserted by instrument HP54201A Response from instrument 8 5 2008 8 Prologix GPIB LAN Controller User Manual 9 3 clr This command sends the Selected Device Clear SDC message to the currently specified GPIB address Please consult the programming manual for details on how a particular instrument responds to this message SYNTAX clr MODES AVAILABLE CONTROLLER 9 4 eoi This command enables or disables the assertion of the EOI signal with the last character of any command sent over GPIB port Some instruments require EOI signal to be asserted in order to properly detect the end of a command SYNTAX
12. tailed configuration steps for various terminal programs Prologix GPIB LAN Controller stores the latest configuration settings in non volatile memoty These settings are not address specific If you have multiple instruments on the GPIB bus that require different configuration settings you must change the settings before communicating with each instrument 7 Operating Modes Prologix GPIB LAN controller can operate in two modes CONTROLLER and DEVICE You can switch between the two modes using mode command see Commands 7 1 Controller Mode In Controller mode the GPIB LAN Controller acts as the Controller In Charge CIC on the GPIB bus When the controller receives a command over the network port terminated by the network terminator CR ASCII 13 or LF ASCII 10 it addresses the GPIB instrument at the currently specified address See addr command to listen and passes along the received data 8 5 2008 5 Prologix GPIB LAN Controller User Manual When Read After Write feature is enabled See auto command Prologix GPIB LAN Controller will addresses the instrument to talk after sending a command in order to read its response All data received from instruments over GPIB is sent to host over the network Read After Write feature simplifies communication with instruments You send commands and read responses without consideration for low level GPIB protocol details When Read After Write feature is not enabled Prolo
13. to use programming environment developed by Ulrich Bangert for developing data acquisition applications Web link to this tool can be found at ptologix biz 8 5 2008 4 Prologix GPIB LAN Controller User Manual Plotter emulators plotter emulation applications such as 7470 exe can be used to obtain screen plots from GPIB enabled instruments using Prologix GPIB LAN controller Details on how to configure these tools are available at prologix biz 5 Network Configuration Prologix GPIB LAN controller supports static IP address and dynamic DHCP IP address The controller s network parameters can be configured using the NetFinder exe tool available at prologix biz 6 GPIB Configuration GPIB parameters of Prologix GPIB LAN controller can be configured using any of the following methods Prologix exe Prologix exe is an open source tool developed by John Miles for configuring the controller Web link to the tool can be found at prologix biz Terminal program any terminal emulation program such as HyperTerminal Tera Term Pro or Minicom can be used to configure the controller by manually entering appropriate commands See Commands Using the terminal program open a TCP connection to port 1234 at Prologix GPIB LAN controller s IP address You may want to enable the Local Echo feature in the terminal program to view the commands being entered Please consult the FAQ at prologix biz or the program s user manual for de
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